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000168894 1001_ $$0P:(DE-HGF)0$$aEbbinghaus, Stefan G.$$b0$$eCorresponding Author
000168894 245__ $$aSingle Crystals of C12A7 $\mathrm{(Ca_{12}Al_{14}O_{33})}$ Substituted with 1 mol % Iron 
000168894 260__ $$aWashington, DC$$bACS Publ.$$c2014
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000168894 520__ $$aSingle crystals of Ca12Al14O33 (C12A7, mayenite) substituted with 1 mol % Fe were grown by the floating zone technique in an atmosphere of 2% O2/98% N2. The iron substitution leads to an increase of the unit cell parameter by roughly 0.002 Å. Optical spectroscopy reveals an additional broad absorption band at 310 nm for the iron-substituted sample reflecting the yellow color of the crystals. XANES measurements at the Fe–K absorption edge prove the incorporation of Fe3+ on the aluminum sites. Measurements of the magnetic susceptibility resulted in a value of 5.8 μB per iron ion as expected for high-spin Fe3+. C12A7 is known to be a very good oxygen ion conductor at high temperatures. In pure oxygen, the iron substitution leads to a slightly reduced conductivity between approximately 500 and 800 °C, while at higher temperatures, the conductivity is very similar to the pristine material. Under reducing conditions, the slope of log(σ) vs log(p(O2)) of the iron-substituted sample was found to be steeper than that for pure C12A7.
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000168894 7001_ $$0P:(DE-H253)PIP1011819$$aKrause, Holger$$b1
000168894 7001_ $$0P:(DE-HGF)0$$aLee, Doh-Kwon$$b2
000168894 7001_ $$0P:(DE-HGF)0$$aJanek, Jürgen$$b3
000168894 773__ $$0PERI:(DE-600)2048329-6$$a10.1021/cg401823k$$gVol. 14, no. 5, p. 2240 - 2245$$n5$$p2240 - 2245$$tCrystal growth & design$$v14$$x1528-7505$$y2014
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